It means we have different parents, but we are like brothers, and we are brothers.Is this the way how people out of China call this kind of "brothers"?

The relationship of this kind of "brothers", we call it "Jie Yi Xiong Di". "Xiong Di" means brothers that have same parents.Jie Yi is a kind of ceremony. When men set up "Jie Yi", they usually hold sacrificial rites to heaven and ancestors.Heaven does not mean where gods live. It means something difficult to describe in Chinese. It is a word about philosophy.